I had the same sound in my dash. It turned out to be air in my heater core which was fixed by bleeding the cooling system. If you aren't getting any cold air, check to see if your compressor is turning, get a friend to sit in the car while you look at the front of the compressor. when he or she pushes the a/c/ button, you will hear a "clack" sound as the compressor clutch engages. The car is running, of course. There are lots of causes for no cooling as I found out this week, but that one is a first step. Good luck.